Process for the dyeing of vat colors on fabrics



Fatented Oct. 29, 192

UNITED STATES JAMES WAKEFIELD, OF COCKERHOUTH, ENGLAND PROCESS FOR THE DYEING OF VAT COLORS ON FABRICS No Drawing. Application filed Kay 21, 1928, Serial No. 279,619, and in Great Britain June 28, 1927.

containing a small quantity of caustic soda and sodium hydrosulfite, running them into an open width bleaching kier, pumping the dye liquor into the kier, running the material a number of times through the dye liquor, emptying the kier of dye liquor, washing the material in the kier with water containing a small quantity of sodium hydrosulfite, again emptying the machine, pumping a developing liquid into the kier and running the material in the developing liquid 'until the color is fully developed, the whose process being carried out without removing the material from the kier.

In carrying out the invention the fabric or piece goods are scoured and bleached in the usual way and are then batched through water containing a small quantity of caustic soda and sodium hydrosulfite after which they are run into an open Width bleaching kier and the lid or cover of the latter screwed on. The kier is then exhausted of air by blowing steam into it. I

The dye bath is prepared in a separate tank connected by a pipe or pipes which the kier into which the dye liquor can be forced by a pump.' In preparing the dye bath it is essential that it should be a well reduced bath.

The material is then started running in the kier and the dye liquor pumped into the machine, six to twelve ends being given according to the dyestufi' usedand the depth of color required. The pump is then reversed and the machine emptied of dye liquor.

As soon as the kier is empty a washing water containing a small quantity of sodium hydrosulfite is pumped into the kier from a second tank and two ends of the material are given. The machine is again emptied and a developing bath of bichromate, perborate or other oxidizing'agent is pumped in from a third tank.

The material is run in'this bath a suflicient' time to thoroughly develop the color after whichv the material is taken out, soured necessary) and soaped in open machine, the main kier being then ready for a fresh batch of material.

VVit-h the process above described the material is kept continuously in motion from the time the dyestufl first enters the kier until it is fully developed and at the same time the material is kept out of all contact with the air whereby agood level dyeing is'obtained. The process also effects a saving in chemicals and allows dealing with large batches of material.

What I claim as my invention and desire to protect by Letters Patent is 2- 1. Process for the dyeing of vat colors, indigo, sulphur colors and mineral khaki colors on fabrics or other piece goods consisting in batching the material through water containing. a small quantity of caustic soda and sodium hydrosulfite,running them into an open Width bleaching kier, pumping a dye liquor into the kier, running the material a number of times through the dye liquor, emp-' tying the kier of dye liquor, washing the maout without removing the material from the kier.

2. ,Process for the dyeing of vat colors, indigo, sulphur colors and mineral kahki colors on fabrics 01' other piece goods consisting in batching the material through water-containing a small quantity of caustic soda and sodium hydrosulfite, running them into an open width bleaching kier, pumping a dye liquor into the kier, running the material a number of times through the dye liquor, emptying the kier of dye liquor, washing the material in the kier with water containing a small quantity of sodium hydrosulfite, again emptying the machine pumping a developing liqui into the kier and running the material in the develop ing liquid until the color is fully developed, the whole process being carried out without removing the material from the kier.-

3. Process for the dyeing of vat colors, indigo, sulphur colors and mineral khaki colors on fabrics or other piece goodsconsisting in batching the material through water containihg a small quantity of caustic soda and sodium hydrosulfite, running them into an open width bleaching kier, preparin the dye bath :5 in a separate tank, pumping t e dye liquor into the kier, running the material a number of times through the dye liquor, emptying the kier of dye liquor, washing the ma- I, terial in the kier wlth water, again empty- 10 ing the machine, pumping a developing liquid into the kier and runnin the material in the developin liquid until t e color is fully developed, t e whole process being carried out without removing the material from the kier. 15 In testimony whereof I have hereunto set myhand. I JAMES WAKEFIELD. 

